#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)

using std::cin; 
using std::cout;
using std::min;
using std::vector;
using vi = vector<int>;
using vvi = vector<vi>;
using ll = long long;

int main() {
	ll n;
	cin >> n;
	
	ll ans = 1e18;
	for (ll i = 2; i * i <= n; ++i) {
		int k = log(n) / log(i);
		ans = min(ans, i + k + n - (ll)pow(i, k));
	}
	
	cout << ans << '\n';
	
	return 0;
}